I have a site that regroup all the hockey junior in Quebec, Canada. I like to give to some registered users of the ability to create their own small, customizable web sites base on few predeterminate templates.
Associations, teams and other should be able to modify their site look, Headers, logo, colors and contents. I don’t want to mix any part of the multi sites with the main site, administration or database, only an entry towards the multi sites, the best will be a kind of visual directory linkink to the each sites and an administration entry for the administrators and publisher.

Can I do something like that?

I don't understand all your question (requirement).

With JMS each website must be considered as totally independent.
Therefore, to create articles, content, modify themes (template) parameters such as logo, colors, ..., you need to give an administrator permission to the user that will manage the website. This will give them to customize their website.
Therefore, the administration of each website is totally independent and there is NO central management from the master website except to define the slave site URL and which directories that must be specific.


JMS share all the files and folders present on the disk.
With Unix platform and when symbolic link is allowed, you can deploy the slave site into a specific folder to allow saving specific files for the specific slave site.